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Child sex offender jailed for filming kids at fast food outlets

A child sex offender has been sentenced to four years behind bars for again targeting children, secretly filming them while exposing himself at fast food restaurants, shopping centres and playgrounds all over Perth.

59-year-old Niaz Ahmed Ali was found guilty of 28 offences including indecent dealings with children under 13 and being a child sex offender near a public place.

The Baldivis man was caught out in January last year at a Harrisdale McDonalds, in Perth’s south.

Niaz Ahmed Ali has been found guilty of indecent dealings with children under 13. (9NEWS) (9NEWS)He's been sentenced to four years behind bars. (9NEWS) (Supplied)

Ali sat across from a 12 year old girl and exposed himself while recording her with a mobile phone hidden in a small food box.

Predicting it wasn’t the first time he’d done it, police then conducted a public appeal, asking people to come forward if they’d seen a man acting suspiciously at fast food outlets and playgrounds.

The appeal resulted in Ali being charged with a raft of offences for preying on and filming children at family restaurants including in Halls Head, Warnbro, Spearwood, O’Connor, East Perth, Cannington and Ellenbrook between 2014 and 2016.

Ali secretly filmed the young children at fast food restaurants. (9NEWS) (9NEWS)The 59-year-old exposed himself while secretly filming. (9NEWS) (Supplied)

Ali has already been behind bars for 16 months and will be eligible for parole next January, after serving two years.